Neoway M590

6.4 Indicator Light (LED)

Table 8 Indicator Light Interface

When the module is operating, the indicator light will flash once a second irrespective of a SIM card inserted or signal strength. To change the LIGHT status indication refer to the AT commands. When the module goes into sleep mode, the LIGHT will stop flashing.

6.5 RF connector

The M590 antenna interface uses a Murata GSC RF connector, Part Number MM9329-2700RA1. The external antenna’s connection is through an RF cable. For packing information please refer to the following picture.

The impedance of the RF interface is 50Ω, the antenna portion of the module should take necessary measures to avoid useful band interfere signals. There should have good shielding between the external antenna and RF connector. Moreover, the external RF cable should be kept far away from all interfere sources, especially the high-speed data signal and ON/OFF power.

The antenna used in the module should be in accordance with the standard of mobile devices. VSWR should between 1.1 and 1.5, input impedance 50Ω. When using multi-port antennas, the separation between each port should be more than 30dB.

6.6 Signal Connector and PCB packing

The signal connectors of theM590 are half circular through hole plated on a 2.54mm pitch. The recommended layout is shown in Diagram 9.

Diagram 9 Recommended PCB Packing Diagram (topview)

If RF pad pin21 is not used, then the corresponding area on the PCB should be cleared of copper. If the PAD is used, keep the track as short as possible and maintain 50 Ohm impedance.

On a double sided PCB where the impedance cannot be well controlled the recommended routing is as follows:

The RF track width should be 0.8mm to 1.0mm The spacing between the track and the surrounding ground plane should be 0.8mm to 1.0mm. The RF line should be completely surrounded by ground plane, and ensure there are a significant number of through holes connecting the bottom layer ground plane to the top layer ground plane. The RF line should be no longer than 15mm, it should be smooth, and have tears when connecting to pads. Avoid any angular routing which may result in reflections. The layer opposite the RF track should be kept clear of copper or tracks. .See Diagram 10 for suggested double-side board design, the module's RF signals connection with SMA RF connectors and then antennas recommended routing.

Module RF test points must have a clearance in the corresponding PCB position of approximately 2mm in diameter. Ensure these pads are encircled by ground plane. Pin 21 should also be cleared if its not used, with a ground plane running as shown in Diagram 9.

Pin 20 of the module should be fully grounded, be sure to include through holes linking top and bottom ground planes close to the pad. Grounding is important for satisfactory operation. Keep in mind that this Module has an RF power amplifier, and it may generate interference with other signal lines. Route the PCB with care to avoid pick up risk and associated possible corruption.

Diagram 10 Recommended PCB Layout Diagram

Should the RF feed (Pin 21) not be used, the corresponding copper on the PCB should

be cleared. Refer to Diagram 11.

Diagram 11 Module design of the 21 pin when not in reference

Notice:

Keep the RF module layout away from high-speed circuits, switching power supplies,

power transformers, large capacitance, and single-chip clock circuit etc.

7. Assembly

The connection of M590 is using SMD soldering connection to pads on the side of the module.

8. Packaging

The M590 is intended to be reflow soldered, it is therefore necessary to prevent any moisture ingress prior to assembly. The M590 is supplied in moisture proof containers and vacuum sealed in aluminum foil bags with humidity indicator cards to ensure reliability and extends shelf life.

In order to facilitate the SMT process, pallets are used to load products For further information on M590 storage and soldering instructions refer to Neoway M590 SMT reflow

production proposal_V1.0

9. Abbreviations

10. Appendix 1.Description of the M590 Sleep mode

Operating current of M590 when connected during data transmission is 220mA. When not connected average current is about 25mA. In sleep mode (low-power state) current draw is 2.5-2.8mA.

In sleep mode, the module will promptly respond to system calls, SMS and data services. The external MCU can also control modules out of sleep mode through hardware IO(DTR).

Process for entering sleep mode:

1)Keep the module DTR input high by setting the AT command to allow entering sleep mode, refer command: at+enpwrsave. In this mode, the run light stops flashing.

2)Pull the DTR input low, using external. Typically the module enter sleep mode in about 2 seconds. In sleep mode, the serial port of the module is disabled and will not respond to data. The module will only go into sleep mode, if there is data present on the serial port the module will wait for data transfer to end before entering sleep mode.

3)If the serial port has data the MCU can place DTR high. The module will immediately exit sleep mode within 50ms to normal mode, and the serial port will respond to AT commands. After the completion of the calling service, the external MCU may pull

In sleep mode the data/commands processed should not exceed 30 characters.

In the event of a call the RING PIN cycles 30mS low pulses for 5 seconds.

With SMS,, after using the AT+CNMI command to set the SMS reminders, when text messages are received, the RING pin will output a low pulse of 25ms.

In the data service calls, RING PIN does not change, it remains high.

TX-RX

External CPU GPRS Module

DTR

Diagram of Control Signal Connecting